As for Nemesis, it was written after Prelude to Foundation, but in the author's note Asimov explicitly states that the book is not part of the Foundation series, but that some day he might tie it to the others.
As for Nemesis, it was written after Prelude to Foundation, but in the author's note Asimov explicitly states that the book is not part of the Foundation series, but that some day he might tie it to the others.
而在基地前奏之后写的复仇女神，艾西莫夫在作者的话中明确的表示这本书并不是基地系列的一部份，但是也许有一天他会把它们放在一起。